[싱글] Aqua (hesitation) (2019) 

Aqua (2011 Live ver.), rendezvous

SOOKI ·  Arrangements,  Piano

[싱글] Dear (2020)

Dear, Bewitched (Rodgers & Hart)

SOOKI ·  Arrangements,  Piano

[싱글] Flower Poem (2021)

   꽃 시, 기억의 시차, 8 o' clock in Seoul

SOOKI ·  Arrangements,  Piano

[싱글] Summer Rain (2022)

Ordinary Day, Summer Rain, Exercise NO 1.

SOOKI ·  Arrangements,  Piano

[싱글] Peaceful Mind (2022)

지난날의 Blues, Peaceful mind, 유성우(meteor shower)

SOOKI ·  Arrangements,  Piano

[EP] Korean Folk Songs (2025)

경기 아리랑, Interlude, 파랑새요, 강강술래, 뱃놀이, 닐리리야

구윤회 · Vocals (뱃놀이) | SOOKI · All Arrangements,  Piano, Strings  (Virtual Instruments), Organ, Electric Piano, Synth 

 [EP] Buffalo Package 1st (2010) 

Superhero, 1! 2! 3! 4! 5!, Fine, 다짐, Talk

구윤회 · Vocals, Background Vocals|  SOOKI · Piano,  Synth,
*String Arrangement (live strings) by SOOKI on "Fine"

[싱글] #감성으로의 회기 (2011)      

바람 좋은 날, 오월애

구윤회 · Vocals |SOOKI · Piano Arrangement

  [싱글] 청춘예찬  (2014)  

구윤회 · Vocals | SOOKI · Piano, Organ, Synth, Arrangement  (incl. strings)

   [싱글] Starry Night (2015)  

구윤회 · Vocals 

 [싱글] 사라져줘요 (2016)  

구윤회 · Vocals | SOOKI · Piano, Electric Piano, Synth, All Arrangement by SOOKI  

[싱글] farewell (2017)

구윤회 · Vocals | SOOKI · Piano, Organ, Synth, Arrangement  

[싱글] Oh yeah! (2017)

 구윤회 · Vocals Arrangement |     SOOKI     Arrangement     

[싱글] rewind (2018)

 떠나, 스치듯 너에게 안녕*

구윤회 · Vocals | SOOKI · Piano, Electric Piano, Organ, Arrangement *Piano only on 스치듯 너에게 안녕

[싱글] rewind vol 2. (2018) 

돌아서는 길

구윤회 · Lyrics, Music, Vocals, Harmonica | SOOKI · Music, Arrangement, Piano, Strings

[싱글] 사랑아 왜 그런가요  (2019)

구윤회 · Vocals, Arr, Background Vocals | SOOKI · Compose, Piano, Organ, String Arrangement 

[싱글] rewind vol 3. (2020)

Starry Night (re-recorded), 이렇게라도 널 향해 있는 게 

구윤회 · Lyrics, Music, Vocals | SOOKI · Music, Arrangement, Piano 

[EP] Korean Folk Songs (2025)

 뱃놀이

구윤회 · Vocals (뱃놀이) | SOOKI · All Arrangements,  Piano, Strings  (Virtual Instruments), Organ, Electric Piano, Synth